掺纤维和膨胀剂混凝土渡槽裂缝特征研究  

Cracking of concrete aqueduct with expansive agent and fiber

作　　者：高翔[1] 陈泽昊[2] 刘宏伟[2] 徐少云[2] 高培伟[2] 

机构地区：[1]东北大学工业设计系,辽宁沈阳110004 [2]南京航空航天大学土木工程系,江苏南京210016

出　　处：《新型建筑材料》2014年第10期18-21,共4页New Building Materials

基　　金：江苏省六大人才基金项目(JZ-010);国家博士后基金项目(2014M551588);江苏省博士后基金项目(1301057B);江苏省建设厅基金项目(2013ZD12)

摘　　要：大型薄壁混凝土渡槽收缩开裂严重地影响渡槽使用功能和寿命.掺纤维和新型膨胀材料可降低混凝土收缩值,减少混凝土渡槽的收缩开裂.通过平板法和圆环法进行混凝土渡槽早期抗裂性能试验,研究了新型膨胀材料和纤维对混凝土渡槽早期塑性开裂性能的影响.试验结果表明,掺6％-8％的膨胀材料可有效补偿和减少混凝土收缩,降低混凝土裂缝的产生和扩展：掺8％膨胀材料和0.6％纤维的抗裂性能较好.Cracks occur easily in large concrete aqueducts,which affect the use function and lifetime of the aqueducts. Anovel expansive agent and fiber were used to compensate the deformation, and to reduce the aqueduct cracks caused by concreteshrinkage. In order to study the influence of the new expansive materials and fibers on the early age cracking behaviors of con-crete aqueduct,the cracking behaviors of concrete aqueduct was analyzed using the modified fiat and ring type specimen. The re-suits show that with 6% to 8% expansive materials,the concrete shrinkage can be effectively reduced and occurrence and develop-ment of cracking can be minimized. The crack resistance performance is best when the content of expansive materials is 8% andthat of fiber is 0.6%.

关 键 词：渡槽 膨胀材料 纤维 混凝土 抗裂 

分 类 号：TU528[建筑科学—建筑技术科学]